Fabric containing organic derivative of cellulose yarn



Patented May 9, 1933 PATENT OFFICE CAMILLE DRE'YFUS, OF NEW YORK, N. Y.-

I'A'BBIC' CONTAINING ORGANIC DERIVATIVE OF CELLULOSE YARN No Drawing. Application filed July 16,

This invention relates to fabric containing yarns of organic derivatives of cellulose and relates more particularly to the preparation of fabric having yarns of cellulose acetate, which fabric is of more uniform appearance than has been heretofore possible.

An object of my invention is to prepare fabric containing yarns of organic derivatives of cellulose, which fabric has a uni-- form appearance. A further object is to avoid the appearance of streaks and the like in fabrics by employing more or less opaque yarn of cellulose acetate as at least part of the yarn of which the fabric is constructed.

Other objects of this invention will appear fronr the following detailed description.

Yarns of cellulose acetate or other organic derivatives of cellulose as ordinarily made are more or less transparent. Moreover the no lustre of such yarn is often not absolutely uniform. Therefore fabric made of such yarn often does not have a uniform appearance, its lustre is not as brilliant as may be desired, and it shows warp streaks 'due to the unevenness of the tension of the warp and to the difference of lustre of the warp yarns, weft bars where the weft pirns have been chan ed, wood grain effects and other streaks. I have found that this is due to 9 the fact-that the yarn is so transparent that most of the irregularities of the warp and bars, streaks and the like and which has more covering power may be made.

In accordance with my invention I prepare a woven fabric contalnlng yarns of cellulose acetate or other organic derivatives of cellulose of increased opacity, whereby 1930. Serial No. 468,460.

any. streaks and the like either do not occur or are not visible.

While this invention will be described specifically in connection with yarn made of cellulose acetate,- it is equally applicable to yarns made of other organic derivatives of cellulose such as cellulose ester and cellulose ethers. Examples of such cellulose esters are cell"lose formate, cellulose propionate and cellulose butyrate, while examples of such cellulose ethers are ethyl cellulose, methyl cellulose and benzyl cellulose.

The yarns of cellulose acetate may have their opacity increased or their transparency decreased in any suitable manner. Thus the yarns may have a finely divided pigment such as titanium oxide, barium sulfate,

barium phosphate, zinc oxide, zinc sulfide, lead sulfate or lithophone, etc. disseminated throughout the filaments thereof. Y This may be done by incorporating the finely divided pigments in amounts say of 0.5 to 3% of the weight of the cellulose acetate in the spinning dope from which the yarns are formed. If desired the yarns may have their opacity increased by treating the same with an aqueous solution of a metal salt, either in-the presence or absence of a swelling agent for the cellulose acetate, and then the yarn treated with a solution of a substance that causes the precipitation of the insoluble pigment.

Another mode of increasing the opacity is to treat yarn of say acetone soluble cellulose acetate with boiling water or wet steam. It is to be noted that it is immaterial whether the lustre of the yarn is reduced or not provided its opacity is increased.

In carryin out this invention, the fabric may be ma e wholly of the yarn of increased opacity. However in many cases it is preferable to use such o aque yarn as only one component of the fa ric'while the other component may be normal yarn of organic derivatives of cellulose of normal transparency or yarns made of other fibres such as natural silk, cotton or reconstituted cellulose. For instance if a cotton warp is employed, the irregularities. of this warp are much less apparent when an opaque yarn cellulose,

invention. By way of example it is pointedout that if a fabric is constructed of warp of the ordinary cellulose acetate yarn and a weft of yarn of increased opacity, streaks due to unevenness of the tension of the warp yarns or the difierence of lustre between the warp yarns is hidden by the opaqueness of the weft yarn. Moreover no weft bars are apparent at those places where the weft pirn has been changed. A further advantage of the fabric made by this invention is that the fabric on the whole is less transparent than fabric made wholly of transparent cellulose acetate yarn, which is important when the fabric is used as lining for coats and the like. Moreover a fabric made by this invention while employing a yarn containing finely divided pigment, wears longer and can be rubbed more times without injury than can the fabric made wholly of the ordinary cellulose acetate yarn.

It is to be understood that the foregoing description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of my invention. 7

Having described my invention, what I claim and desire to secure by Letters Patent 1. Method of preparing a fabric that is substantially free of warp streaks comprising weaving a .warp consisting of normal yarns with a weft consisting wholly of yarns of organic derivatives of cellulose of increased opacity. p 2. Method of preparing a fabric that is substantially free of warp streaks comprising weaving a warp consisting of normal yarns with a weft consisting wholly of yarns of cellulose acetate of increased opacity.

3. Method of preparing a fabric that is substantially free of warp streaks comprising weaving a warp consisting of normal yarns with a'weft consisting wholly of yarns of cellulose acetate of increased opacity having a finely divided pigment therein.

4:. A fabric of substantially uniform appearance and free of warp streaks having a weft of organic derivative of cellulose yarn of increased opacity and a warp of yarn of normal lustre. 

